Malaria is caused by parasite Plasmodium vivax or falciperum. In this disease R.B.Cs are destroyed.

The shape of red blood corpuscles is

Spherical

Double convex

Double concave

None of these

Solution

Double concave

The sticks of a match box are arranged to form different figures. Which of the following figures cannot be formed?

Solution

Which organ of human body has the largest number of bones?

Fingers

Brain

Chest

None of these

Solution

Finger

Dr. Har Gobind Khorana was honoured with Nobel Prize of Medicine for :

Genetic code deciphering

Reading essay on genes

Discovering DNA composition

None of these.

Solution

Discovering DNA composition

Which of the following pollutants are Inhaled by a traffic constable?

CO, PbO2 , SO2

lead

SO2 , Pb,

CO2, SO2

Solution

CO, PbO2 , SO2

Two persons A and B are standing between two mountains. If A fires a gun with the velocity of sound, B listens its echo after 2 seconds; when B fires. A listens the echo after 4 seconds. Both fire in opposite directions. What is the distance between the mountains?

990 m

1920 m

1620 m

1720 m

Solution

Velocity of Sound = 330 m/sec.
Distance of Peak P from A
=AP=1⁄2 Distance travelled in 2sec 2 by bullet

=1⁄2 × 330 m/sce. × 2
= 330 meters Distance of peak Q from B

= BQ =1⁄2 Distance travelled I 4 sec

= 1⁄2×330×4= 660 metres

Thus PQ =AP + BQ
= 330 + 660 = 990 metres

A fuse wire is made of

Copper and iron

Lead and tin

Copper and tin

Copper and lead

Solution

Lead and tin

What is condensation?

Change from vapour to water

Change from water to vapour

Change from solid to liquid

Change from liquid to solid

Solution

Change from vapour to water phase of an item by reducing the temp. is called condensatlon., Also,change from water to vapaur is called vaporisation, solid to liquid is melting and from liquid to solid is called freezing.